Heat sink



FIG. 1 is a perspective view of a heat sink showing my new design;

FIG. 2 is a right side view thereof, the left side view being a mirrorimage of the right side view;

FIG. 3 is a front view thereof, the rear view being a mirror image ofthe front view;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The heat sink is shown broken away in FIGS. 1-5 of the drawing toindicate indeterminate length, it being understood that it has a uniformshape and appearance through its length.

Portions or features of the heat sink shown in broken lines form no partof the claimed design.

CLAIM The ornamental design for heat sink, as shown and described.